Ski lift seat



FIG. 1 is a perspective view of the ornamental design for a ski lift seat;

FIG. 2 is a top plane view of the design;

FIG. 3 is a front view of the design;

FIG. 4 is a rear view of the design;

FIG. 5 is a side view of the design; and,

FIG. 6 is a bottom view of the design. 

The ornamental design for a ski lift seat, substantially as shown. 